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Pleasant Morning, Wouldn't you say, Doctor? You can simply begin your plans anew. Even if all of your efforts this last time were utterly wasted. Even if it was a complete and humiliating loss. Even the most pathetic loser in all the world will surely have his chance to--
~ Orbot mocking Eggman in Sonic Unleashed.

SA-55, nicknamed Ergo by fans, is the secondary antagonist of Sonic Unleashed. He was a robot built by Dr. Eggman, who served as his right-hand assistant and advisor during the Dark Gaia incident. He is the prototype and predecessor to Orbot.

Although he was generally loyal to Eggman, he constantly berated his creator and mocked him for his failures. Due to this, he was eventually reprogrammed into the more loyal assistant Orbot.

He is voiced by Christopher Collet.


Sonic Unleashed

In Sonic Unleashed, SA-55 assisted Eggman in his plan to use the power of Dark Gaia, which had scattered around the world when Eggman awoke it, to construct Eggmanland. He oversaw this process, doing the mechanical processes involved and relaying information of the plan's progress. When Eggman deployed his Egg Cauldron to take of Sonic in the Tornado-1, SA-55 warned Eggman that it was incomplete and to handle it gently, but was ignored.

SA-55 later accompanied Eggman on his trip to Mazuri to secure a Gaia Temple. There, he laughed at Eggman when he was pegged in the face by a rock thrown by Kwod before he was shut up by the doctor. When Sonic then came to the villagers' rescue, SA-55 came with Eggman as he escaped.

Back at Eggman's base, SA-55 presented Eggman with his dinner and reported that his plans were behind schedule, which SA-55 constantly noted was the doctor's own fault while pointing out the undesired results of his hasty actions. As Eggman contemplated on how to gather Dark Gaia's pieces, SA-55 gave his suggestions, but was brushed aside when Eggman had the idea of attracting them with an energy pulse. As Eggman's plan proved to be successful, SA-55 commenced Project Dark Gaia upon Eggman's clearance.

Later on, SA-55 was in Eggman's Egg Mobile with Eggman as the doctor was defeated by Sonic in the Egg Dragoon and then knocked into the horizon by Dark Gaia appeared. Landing in a rocky region as Sonic and Chip defeated Dark Gaia and thwarted Eggman's plans, SA-55 suggested to Eggman that he could begin anew as he listed all the ways the doctor's plans had failed, making Eggman snap and try to kick him. SA-55, however, dodged the kick and ran off with the doctor chasing after him.

Offscreen, it is implied he is caught and reprogrammed against his will into the more loyal robot Orbot, who first appears in Sonic Colors.


SA-55's personality is rather artificial, being stiff and mechanical in behavior and speech. Combined with his sassiness, he is utterly, comically tactless. Even so, he displays an open lack of respect and invective language; he laughs openly at Eggman's physical misfortune and directly insults Eggman with snarky comments and sarcastic remarks at the doctor's expense.


Remember, doctor, it is not yet, complete. handle it gently.
~ Orbot's protorype
Your dinner, doctor.
~ Orbot's prototype ordering his dinner.
That, doctor is the result of the power of the Chaos Emeralds, which you discarded along with Sonic. Ergo, another repercussion of your hasty actions.
~ Orbot's prototype


  • He was nicknamed "Ergo" by fans due to his frequent use of the word while dissecting Eggman's plans.
  • His name, SA-55 is leetspeak for Sass.
  • The Archie Sonic continuity seems to treat SA-55 and Orbot as a single character, SA-55 being Archie Orbot's production number.
            Sonic the Hedgehog logo.png Villains

Eggman Empire
Dr. Ivo "Eggman" Robotnik | Metal Sonic | Orbot (prototype) | Cubot | EggRobos | Lone EggRobo | Mecha Sonic | Silver Sonic | Mecha Knuckles | Badniks (Egg Pawns) | Tails Doll | Heavy King | Hard-Boiled Heavies | E-100 Alpha | E-101 Beta | Eggman Enterprises | MeteorTech | SCR-HD | Time Eater | Jackal Squad (Infinite) | Replicas Accevive Corp | Robotnik Corp | Hey Ho

Team Dark
Shadow the Hedgehog | Rouge the Bat | E-123 Omega

Babylon Rogues
Jet the Hawk | Wave the Swallow | Storm the Albatross

Eggman Nega's Forces
Eggman Nega | Metal Sonic 3.0

Deadly Six
Zavok | Zazz | Zeena | Master Zik | Zomom | Zor

Black Arms
Black Doom | Eclipse the Darkling

Mephiles the Dark | Iblis (Iblis's Minions)

Nocturnus Clan
Imperator Ix

Battle Kukku Empire
Great Battle Kukku | Battle Kukku XVI | Dr. Fukurokov

Bearenger the Bear | Fockewulf the Wolf | Carrotia the Rabbit | Witchcart

Dr. Eggman | Hard-Boiled Heavies (Heavy King, Heavy Gunner, Heavy Shinobi, Heavy Magician, Heavy Rider) | Metal Sonic

Sonic Boom
Charlie | D-Fekt | Dave the Intern | Dr. Eggman | Lyric the Last Ancient | Mark the Tapir | Metal Sonic | Morpho | Nominatus | Shadow the Hedgehog | Swifty the Shrew

Dr. Robotnik | Agent Stone | Echidna Tribe (Pachacamac) | Scavengers | Lindsey and Jason | Unit

Babylon Guardian | Biolizard | King Arthur | Boom Boos | Dr. Ivo Robotnik (USA) | Scorpius | Captain Whisker | Chaos | Dark Gaia (Dark Gaia's Minions) | Erazor Djinn | Fang the Sniper | Feist | G-merl | King Boom Boo | Ifrit | Merlina | Professor Gerald Robotnik | Pachacamac

See Also
Sonic Cartoon Villains | Sonic Comic Villains | Sonic Manga Villains | Sonic X Villains